A way to get new phone and vm not knowing?

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http://androidforums.com – I was wondering since I'm still grandfathered in the 25 dollar plan. Is there a way to buy a new phone, and transfer your number to it without vm help and keeping the 25 dollar plan? I gave the phone to my mom and she's still using it but she's thinking of an upgrade but we don't because of the 25 dollar plan seems like a waste to pay 10$ more for same plan. So is there a possible way to buy a new phone/or used? I'm guessing no but worth a shot to ask. (General)